Making Your Own Knitwit Tool

I wanted to make a project using the Knit Wit tool, however, everywhere I look they are sold out (wonder if it is because the project is featured in the December Martha Stewart magazine? hmm). Anyway I am looking at it online and it seems as though I should be able to make one. Does anyone have any ideas? Thanks.

Judging from the pic at the link below it looks like you could just get a precut wood circle fromt the craft or hardware store and put in small headless nails or brads and perhaps a dowel for the handle. http://doodleloom.com/